Make the field private

Author: kazk

src/common/sec_websocket_extensions.rs

@@ -61,7 +61,7 @@ use {Error, Header, HeaderValue};
 /// [RFC6455_11.3.2]: https://tools.ietf.org/html/rfc6455#section-11.3.2
 /// [RFC7692_7]: https://tools.ietf.org/html/rfc7692#section-7
 #[derive(Clone, Debug, Eq, PartialEq)]
-pub struct SecWebsocketExtensions(pub Vec<WebsocketExtension>);
+pub struct SecWebsocketExtensions(Vec<WebsocketExtension>);
 
 impl Header for SecWebsocketExtensions {
     fn name() -> &'static ::HeaderName {